Elevating-jack.



LE GRAND SPARKS.

ELEVATING JACK.

APPLICATION FILED MAY a, 1916.

1 03,925. Patented Nov. 7, 1916.

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LE GRAND SPARKS, 0F MONTGOMERY, NEW YORK.

'ELEVA'IINGr-J'ACK.

Specification of Letters Patent.

Patented Nov. *7, 1916.

Application filed May 8, 1916. Serial No. 96,203.

To all whom z't may concern:

Be it known that I, LE GRAND SPARKS, a citizen of the United States,residing at Montgomery, in the county of Orange, State of New York, haveinvented certain new and useful Improvements in Elevating- Jacks; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This .invention relates to elevating jacks and has special reference tothat type of elevating jack commonly called a screw jack.

One improved object of the invention is to provide a jack of thisdescription wherein the operating crank for the jack will be located ata distance from the body of the jack or stand so that the latter may bepositioned beneath an automobile or the like and operated without makingit necessary for the user to get beneath the machine.

Another improved object of the invention is to provide a jack of thisdescription which is so arranged that, when not in use, the operatinghandle may be folded so that the jack will not take up excessive space.

With the above and other objects in view, as will be hereinafterapparent the invention consists in general of certain novel details ofconstruction and combinations of parts hereinafter fully described,illustrated in the accompanying drawing, and specifically claimed.

In the accompanying drawing, like characters of reference indicate likeparts in the several views, and Figure 1 is a side elevation of a jackconstructed in accordance with this invention; Fig. 2 is a plan viewthereof; Fig. 8 is a section on the line 33 of Fig. 1; Fig. 1 is asection on the line 4-4: of Fig. 1.

In carrying out the objects of this invention and in the presentdisclosure there is shown a base 10 having a tubular member 11 extendingupwardly therefrom and constituting a stand. An elevating screw 12provided with the usual swiveled head 13 is telescopically mounted inthe tubular member 11 and is prevented from rotation relative to saidtubular member by a suitable set screw 14 passing through the side ofthe tubular member and entering a. spline -way 15 formed longitudinallyof the screw. Resting on top of the member 11 is a crown gear 16provided with a centrally disposed threaded opening fitting on the screwand constituting the operating nut therefor so that when the gear isrotated the screw will be moved in or out of the tubular memberaccording to the direction of such rotation.

Projecting from opposite sides of the tubular member is a pair of alinedstub shafts l7 and 18. On the shaft 17 is rotatably mounted anintermediate crown gear 19 which meshes with the gear 16.

At 20 is a curved arm which has one end pivotally mounted as at 21 onthe stub shaft 18 and this arm is curved around the member 11 and thenprojects tangentially to the curve as at 22 and terminates injuxtaposition to the intermediate gear 19. The free end of this arm hasrigidly fixed thereto the inner end of a. sleeve 23 which extendsradially to the axis of the stub shafts and is of considerable length.Journaled in this sleeve 28 is a crank shaft 2-1 and on the inner end ofthis crank shaft isa driving gear 25 which meshes with the gear 19 sothat when the crank shaft is rotated and the sleeve 23 held stationarythe gear 19 will rotate and thus effect rotation of the gear 16. On theouter end of the shaft 2 1 is provided a crank handle 26 for the purposeof rotating said shaft.

It will be obvious that if the sleeve 23 was not prevented from movementthere would be a tendency for the gear 25 to travel around the gear 19instead of moving this gear. To stop the movement of the sleeve 23 whenthe gear 25 is in operative position there is provided on the member 11a lug 27 which engages with the arm 20 when the sleeve 23 is inhorizontal position, this being the preferable operative position.

It will be noted that the gear 25 is much smaller than the gear 16 sothat rotation of the crank handle 26 will cause a powerful rotation ofthe gear 16.

When the device is not in use the sleeve 23 will naturally, through theweight of the sleeve and connected parts, drop downward to the positionshown in dotted lines in Fig. 1, the arm 20 resting against the member11 or the crank handle resting on the ground as the case may be.

hen it is desired to use the device the sleeve 23 is moved to operativeposition and the arm 20 will then engage the lug 27. The jack may thenbe lifted by the sleeve 23 and placed in the desired position beneaththe automobile, the crank handle sticking out from under the machine.Then, by rotating the crank handle in the proper dlrectlon the gear 16is caused to rotate and thus in turn will cause upward movement of thescrew 12.

There has thus been provided a simple and eiiicient device of the kinddescribed and for the purpose specified.

It is obvious that many minor changes may be made in the form andconstruction of the invention without departing from the materialprinciples thereof. It is not therefore desired to confine the inventionto the exact form herein shown and described but it is wished to includeall. such as properly come within the scope claimed.

Having thus described the inventioinwhat is claimed as new is 1. In aack, a base having a tubular member extending upwardly therefrom andconstituting a stand, an elevating screw telescopically mounted in saidtubular member, a driven gear having a centrally disposed threadedopening constituting a nut and fitting on said screw, a pair of alinedstub shafts projecting from opposite sides of the tubular member, anintermediate gear mounted on one of said. shafts, a curved arm mountedon theother shaft and extending the axis of said shafts, a crank shaftmounted in said sleeve, a driving gear on the inner end of the crankshaft and a crank handle on the outer end of the crank shaft.

2. In a jack a base having a tubular member extending upwardly therefromand constituting a stand, an elevating screw telescopically mounted insaid tubular member, a driven gear having a centrally disposed threadedopening constituting a nut and fitting on said screw, a pair of alinedstub shafts projecting from opposite sides of the tubular member, anintermediate gear mounted en one of said shafts, a curved arm mounted onthe other shaft and extending around the tubular member intojuxtaposition to the intermediate gear, a sleeve on the free end of saidarm extending radially to the axis of said shafts, a crank shaft mountedinsaid sleeve, a driving gear on the inner end of the crank shaft, acrank handle on the outer end of the crank shaft and a lug on saidtubular membe and constituting a stop to limit upward movement of saidarm.

In. testimony whereof, I affix my signature, in the presence of twowitnesses.

LE GRAND SPARKS. Witnesses: V

A. G. BROWNE, I Housron BnowN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

